JPH05308768A - Stator yoke for stepping motor - Google Patents
Stator yoke for stepping motorInfo
- Publication number
- JPH05308768A JPH05308768A JP4136186A JP13618692A JPH05308768A JP H05308768 A JPH05308768 A JP H05308768A JP 4136186 A JP4136186 A JP 4136186A JP 13618692 A JP13618692 A JP 13618692A JP H05308768 A JPH05308768 A JP H05308768A
- Authority
- JP
- Japan
- Prior art keywords
- stator yoke
- small
- stepping motor
- powder
- manufacture
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000000843 powder Substances 0.000 claims abstract description 19
- 239000002184 metal Substances 0.000 claims abstract description 13
- 229910052751 metal Inorganic materials 0.000 claims abstract description 13
- 229920003002 synthetic resin Polymers 0.000 claims abstract description 8
- 239000000057 synthetic resin Substances 0.000 claims abstract description 8
- 239000002131 composite material Substances 0.000 claims abstract description 6
- 238000001746 injection moulding Methods 0.000 claims abstract description 5
- 238000010438 heat treatment Methods 0.000 claims abstract description 4
- 229920001169 thermoplastic Polymers 0.000 claims description 5
- 239000004416 thermosoftening plastic Substances 0.000 claims description 5
- 239000011230 binding agent Substances 0.000 claims description 4
- 239000000696 magnetic material Substances 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 10
- 238000000034 method Methods 0.000 abstract description 4
- 238000007796 conventional method Methods 0.000 abstract description 3
- 238000000465 moulding Methods 0.000 abstract description 2
- 229920001187 thermosetting polymer Polymers 0.000 abstract 1
- 239000000463 material Substances 0.000 description 7
- 230000020169 heat generation Effects 0.000 description 3
- 230000007423 decrease Effects 0.000 description 2
- 230000002950 deficient Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- -1 polypropylene Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K37/00—Motors with rotor rotating step by step and without interrupter or commutator driven by the rotor, e.g. stepping motors
- H02K37/10—Motors with rotor rotating step by step and without interrupter or commutator driven by the rotor, e.g. stepping motors of permanent magnet type
- H02K37/12—Motors with rotor rotating step by step and without interrupter or commutator driven by the rotor, e.g. stepping motors of permanent magnet type with stationary armatures and rotating magnets
- H02K37/14—Motors with rotor rotating step by step and without interrupter or commutator driven by the rotor, e.g. stepping motors of permanent magnet type with stationary armatures and rotating magnets with magnets rotating within the armatures
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/02—Details of the magnetic circuit characterised by the magnetic material
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K5/00—Casings; Enclosures; Supports
- H02K5/02—Casings or enclosures characterised by the material thereof
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Iron Core Of Rotating Electric Machines (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Abstract
Description
【0001】[0001]
【産業上の利用分野】本発明はステッピングモータ、特
にOA機器用に好適な小型ステッピングモータのステー
タヨークに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stepping motor, and more particularly to a stator yoke of a small stepping motor suitable for office automation equipment.
【0002】[0002]
【従来の技術】PM型の2相ステッピングモータは、図
5に示すように、2個1対の缶型ステータヨーク11、
11と、同じく2個1対のフラット型ステータヨーク1
2、12、および2個1対のコイル13、13と1個の
ロータ4とよりなる。2. Description of the Related Art A PM type two-phase stepping motor is shown in FIG.
11 and two pairs of flat stator yokes 1
2, 12 and a pair of two coils 13, 13 and one rotor 4.
【0003】ところで、ステッピングモータの従来のス
テータヨークは、素材たる板金をプレス加工により製作
しており、その成型は、フラット型ステータヨークのば
あいを例に挙げると、図4に示すように金属板からのブ
ランク円板の打ち抜き工程(a)、ブランク円板の深絞
り工程(b)、歯部抜き工程(c)、歯部曲げ工程
(d)の4工程を経て行われ、缶型ステータヨークのば
あいも同じような工程で行われる。By the way, the conventional stator yoke of the stepping motor is manufactured by pressing a sheet metal, which is a material, and its molding is performed as shown in FIG. 4 in the case of a flat type stator yoke. The blank disk is punched out from the plate (a), the blank disk is deep-drawn (b), the tooth part is punched out (c), and the tooth part is bent (d). In the case of York, the same process is performed.
【0004】[0004]
【発明が解決しょうとする課題】プレス加工によりステ
ータヨークを製造する従来の方法では、小型ステッピン
グモータのばあい、ステータヨークの歯の部分が小さく
なるので、プレス工具も小さくなり、ために打抜きショ
ット時の衝撃で工具が破損する頻度が大で、工具破損に
より不良品のステータヨークが製造されることが少なく
なく、製品歩留は良好でない。In the conventional method of manufacturing a stator yoke by press working, in the case of a small stepping motor, the teeth of the stator yoke become smaller, so the press tool also becomes smaller, which results in punching shots. The tool is frequently damaged by the impact at the time, and a defective stator yoke is often manufactured due to the tool damage, and the product yield is not good.
【0005】しかもプレス加工のばあいは、ステータヨ
ーク用の素材たる板金が薄物でなければならず、板厚が
制約されるばかりか、小型のものでは歯を含む全体の形
状も制約を受ける。Further, in the case of press working, the sheet metal as a material for the stator yoke must be thin, and not only the plate thickness is restricted but also the small shape is restricted in the entire shape including the teeth.
【0006】さらに、プレス加工によるばあいは缶型ス
テータヨークは当然のこととして、フラット型のステー
タヨークも図5の符号12、12で示すように2個製造
せねばならない。また、プレス加工により製造されたス
テークヨークを備えるステッピングモータでは、その性
能上も、ステータヨークは固有電気抵抗が低いため、モ
ータを駆動する磁束によって渦電流がステータヨークに
流れ、この渦電流による電流損失が大きい。Further, in the case of press working, as well as the can type stator yoke, two flat type stator yokes must be manufactured as shown by reference numerals 12 and 12 in FIG. In addition, in a stepping motor having a stake yoke manufactured by press working, the stator yoke also has a low specific electric resistance in terms of its performance. The loss is large.
【0007】特に、高速回転になるほど渦電流による損
失が増加し、ために入力電力のうちの回転エネルギーに
変換される電力が少なくなり、高速回転時におけるトル
クが減少する。また、渦電流は熱となり、小型のモータ
のばあいは放熱面積が小さいためモータの温度が上昇
し、この温度上昇はモータの信頼性に悪影響を与える。In particular, as the rotation speed increases, the loss due to the eddy current increases, so that the electric power converted into the rotational energy of the input electric power decreases, and the torque during the high speed rotation decreases. Further, the eddy current becomes heat, and in the case of a small motor, the heat radiation area is small, so the temperature of the motor rises, and this temperature rise adversely affects the reliability of the motor.
【0008】それで発熱に耐えられるように、コイルの
絶縁皮膜は耐熱性にすぐれたものを使用するようにして
いるが、耐熱性の絶縁皮膜は高価で、いきおい製品のコ
ストを高めることになる。Therefore, in order to withstand the heat generation, the insulating film of the coil is made to have excellent heat resistance, but the heat resistant insulating film is expensive, which increases the cost of the product.
【0009】以上のように、板金製のステータヨークを
用いたステッピングモータにおいては、ステータヨーク
の固有電気抵抗が低いことが高速回転化、小型化のネッ
クとなっていた。As described above, in the stepping motor using the sheet-made stator yoke, the low specific electric resistance of the stator yoke has been a bottleneck for high-speed rotation and downsizing.
【0010】本発明は製造が容易で、しかも製品歩留を
向上せしめることができ、また、フラット型のステータ
ヨークは2個製造する必要がなく、1個で事が足り、さ
らに固有電気抵抗が小なることに基因する欠点が解消さ
れたステータヨークを使用することにより、ステッピン
グモータを高速回転化、小型化できるようにした。The present invention is easy to manufacture, and the product yield can be improved. Further, it is not necessary to manufacture two flat type stator yokes, one is sufficient, and the specific electric resistance is further improved. By using the stator yoke, which eliminates the drawbacks caused by the small size, the stepping motor can be rotated at high speed and downsized.
【0011】[0011]
【課題を解決するための手段】本発明に係るモータ用ス
テータヨークは、軟磁性体よりなる金属粉に熱可塑性合
成樹脂の粉末をバインダとして混合せしめた複合粉末物
を加熱下で射出成型したものとしてある。A motor stator yoke according to the present invention is a composite powder material obtained by mixing a metal powder made of a soft magnetic material with a powder of a thermoplastic synthetic resin as a binder, and injection molding the same under heating. There is.
【0012】[0012]
【作用】本発明に係るモータ用ステータヨークに使用す
る材料は軟磁性体よりなる金属粉末に熱可塑性合成樹脂
の粉末を混合せしめた複合粉末物であるので、加熱によ
り合成樹脂粉は溶融して金属粉のバインダーとなり、し
たがって射出成型により所要の形状のステータヨークを
容易に製造できる。Since the material used for the stator yoke for a motor according to the present invention is a composite powder material in which a powder of thermoplastic synthetic resin is mixed with a metal powder of a soft magnetic material, the synthetic resin powder is melted by heating. It serves as a binder of metal powder, and therefore, a stator yoke having a desired shape can be easily manufactured by injection molding.
【0013】また、このように製造されたステータヨー
クは固有電気抵抗が比較的大であり、したがって渦電流
の発生が少なく、熱の発生が小で電流損失が少なく、こ
のステータヨークを用いたモータは高速回転、小型化が
可能となる。In addition, the stator yoke manufactured in this manner has a relatively large specific electric resistance, so that the generation of eddy current is small, the heat generation is small, and the current loss is small, and the motor using this stator yoke is small. Enables high-speed rotation and miniaturization.
【0014】[0014]
【実施例】以下に本発明の実施例を説明する。EXAMPLES Examples of the present invention will be described below.
【0015】図1に本発明に係るステータヨークを備え
るステッピングモータの分解斜視図を示し、符号1、1
はツーパーツよりなる2個1対の缶型のステータヨー
ク、2は1個のワンパーツよりなるフラット型ステータ
ヨーク、3及び3はコイル、4はロータ、5はフランジ
板を示し、1a、2aは各ステータヨークの歯部を示
す。FIG. 1 is an exploded perspective view of a stepping motor provided with a stator yoke according to the present invention, which is denoted by reference numerals 1 and 1.
Is a pair of two can type stator yokes made of two parts, 2 is a flat type stator yoke made of one part, 3 and 3 are coils, 4 is a rotor, 5 is a flange plate, and 1a and 2a are The tooth part of each stator yoke is shown.
【0016】本発明においては、缶型ステータヨーク
1、1およびフラット型ステータヨーク2の材料に軟磁
性体の金属粉末と熱可塑性合成樹脂の粉末との複合粉体
を使用するが、金属粉には鉄粉を使用し、また熱可塑性
合成樹脂にはポリプロピレン系のものを使用する。In the present invention, the can type stator yokes 1, 1 and the flat type stator yoke 2 are made of a composite powder of a soft magnetic metal powder and a thermoplastic synthetic resin powder. Is an iron powder, and the thermoplastic synthetic resin is a polypropylene type.
【0017】前記組成よりなる複合粉末物を通常のイン
ジェクション成型機に入れ、加熱しながら成型して所要
形状のステータヨークを製造する。A composite powder having the above composition is put into a usual injection molding machine and molded while being heated to manufacture a stator yoke having a required shape.
【0018】このようにして射出成型されたステータヨ
ークを備える図2に示すステッピングモータと、従来の
板金プレス加工により成型されたステータヨークを備え
るステッピングモータ(何れのステッピングモータも回
転軸の直径は8mm)との各プルイントルク(Pull-in
torque) 特性(起動特性)を測定したところ、図3に示
される結果が得られた。The stepping motor shown in FIG. 2 having the stator yoke injection-molded as described above and the stepping motor having the stator yoke molded by the conventional sheet metal press working (both stepping motors have a rotating shaft diameter of 8 mm). ) And each pull-in torque (Pull-in
When the torque) characteristic (starting characteristic) was measured, the results shown in FIG. 3 were obtained.
【0019】この特性図から理解できるように、従来の
板金プレスによるステータヨークのステッピングモータ
においては、最大起動周波数は1500Hz近くであっ
たが、本発明のステータヨークを備えるモータの最大起
動周波数は2000Hz近くであり、500Hzも周波
数帯域が広くなった。As can be understood from this characteristic diagram, in the conventional stepping motor of the stator yoke by the sheet metal press, the maximum starting frequency was close to 1500 Hz, but the maximum starting frequency of the motor equipped with the stator yoke of the present invention is 2000 Hz. It is near, and the frequency band has widened to 500 Hz.
【0020】[0020]
【発明の効果】本発明によれば、インジェクションによ
りステータヨークを製造できるので、板金プレスによる
従来の手法のばあいに比し製造工程がはるかに少なくな
り、また小型ステッピングモータ用のばあいにおける小
さな歯部を有すものでも所要形状に精度よく成型でき
て、不良品が出るのを極力防止でき、製品歩留をはるか
に向上せしめることができる。According to the present invention, since the stator yoke can be manufactured by injection, the number of manufacturing steps is much smaller than that of the conventional method using a sheet metal press, and the small size is required in the case of a small stepping motor. Even a toothed part can be molded into a required shape with high accuracy, defective products can be prevented as much as possible, and the product yield can be greatly improved.
【0021】しかもフラット型ステータヨークはツーパ
ーツで1対をなすものとする必要がなく、ワンパーツで
事が足り、パーツ点数を少なくでき、製造コストの低減
を期せる。Moreover, the flat type stator yoke does not have to be a pair of two parts, one part is sufficient, the number of parts can be reduced, and the manufacturing cost can be reduced.
【0022】さらに、本発明のステータヨークは軟磁性
金属粉に電気絶縁抵抗の大なる合成樹脂材をバインダー
として混合した材料で成型してあるので、ステータヨー
クは電気的固有抵抗が大となっており、ために通電によ
る渦電流の発生が少く、したがって発熱量も小で電流損
失が少なく、能力の高い高速回転の可能なステッピング
モータを製造でき、しかもステータヨークの歯部が所要
形状に成型されていて、小型ではあるが信頼性の高いス
テッピングモータを提供できる利点がある。Further, since the stator yoke of the present invention is made of a material in which soft magnetic metal powder is mixed with a synthetic resin material having a large electric insulation resistance as a binder, the stator yoke has a large electric specific resistance. Therefore, the generation of eddy current due to energization is small, therefore the amount of heat generation is small, the current loss is small, and it is possible to manufacture a stepping motor capable of high-speed rotation with high performance. However, there is an advantage that it is possible to provide a highly reliable stepping motor that is small in size.
【図1】本発明に係るステータヨークを備えるステッピ
ングモータの分解斜視図。FIG. 1 is an exploded perspective view of a stepping motor including a stator yoke according to the present invention.
【図2】同モータの一部破断斜視図。FIG. 2 is a partially cutaway perspective view of the motor.
【図3】モータのプルイントルク特性の比較図。FIG. 3 is a comparison diagram of pull-in torque characteristics of motors.
【図4】従来の板金プレスによる手法によるばあいの加
工工程図。FIG. 4 is a process drawing of a case using a conventional sheet metal press method.
【図5】従来のステータヨークを備えるステッピングモ
ータの分解斜視図。FIG. 5 is an exploded perspective view of a stepping motor including a conventional stator yoke.
1、2 ステータヨーク 1a、2a 歯部 3 コイル 4 ロータ 5 フランジ板 1, 2 Stator yoke 1a, 2a Tooth part 3 Coil 4 Rotor 5 Flange plate
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.5 識別記号 庁内整理番号 FI 技術表示箇所 B29L 31:34 4F ─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 5 Identification code Office reference number FI technical display location B29L 31:34 4F
Claims (1)
脂の粉末をバインダとして混合せしめた複合粉末物を加
熱下で射出成型してなるステッピングモータ用ステータ
ヨーク。1. A stator yoke for a stepping motor, which is obtained by injection-molding a composite powder obtained by mixing a powder of a thermoplastic synthetic resin as a binder with a metal powder of a soft magnetic material under heating.
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP4136186A JPH05308768A (en) | 1992-04-28 | 1992-04-28 | Stator yoke for stepping motor |
US08/052,165 US5331237A (en) | 1992-04-28 | 1993-04-23 | Stepping motor |
EP93303324A EP0568347A1 (en) | 1992-04-28 | 1993-04-28 | Stepping motor |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP4136186A JPH05308768A (en) | 1992-04-28 | 1992-04-28 | Stator yoke for stepping motor |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH05308768A true JPH05308768A (en) | 1993-11-19 |
Family
ID=15169361
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP4136186A Pending JPH05308768A (en) | 1992-04-28 | 1992-04-28 | Stator yoke for stepping motor |
Country Status (3)
Country | Link |
---|---|
US (1) | US5331237A (en) |
EP (1) | EP0568347A1 (en) |
JP (1) | JPH05308768A (en) |
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US20070008063A1 (en) * | 2004-08-13 | 2007-01-11 | Cts Corporation | Rotary actuator with non-contacting position sensor |
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US8450999B2 (en) | 2009-02-17 | 2013-05-28 | Cts Corporation | Rotary position sensor |
JP5605997B2 (en) * | 2009-03-05 | 2014-10-15 | 山洋電気株式会社 | Stator for rotating electrical machine |
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JPH02294239A (en) * | 1989-05-08 | 1990-12-05 | Seiko Epson Corp | Manufacture of motor stator |
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US7423358B2 (en) * | 2003-08-26 | 2008-09-09 | Delta Electronics, Inc. | Stator structure and manufacturing method thereof |
JP2006025559A (en) * | 2004-07-09 | 2006-01-26 | Denso Corp | Ac motor and control unit therefor |
JP4543793B2 (en) * | 2004-07-09 | 2010-09-15 | 株式会社デンソー | AC motor and its control device |
JP2006060944A (en) * | 2004-08-20 | 2006-03-02 | Fdk Corp | Stepping motor and manufacturing method for its pole teeth |
JP4510548B2 (en) * | 2004-08-20 | 2010-07-28 | ミネベア株式会社 | Stepping motor |
US8585156B2 (en) | 2005-11-02 | 2013-11-19 | Hitachi Construction Machinery Co., Ltd. | Travel control device for work vehicle and work vehicle |
KR101120507B1 (en) * | 2005-12-21 | 2012-02-29 | 주식회사 동서전자 | Pan-cake type single phase brushless dc motor |
JP2007270696A (en) * | 2006-03-31 | 2007-10-18 | Hitachi Ltd | Displacement type compressor |
JP2009077514A (en) * | 2007-09-20 | 2009-04-09 | Panasonic Electric Works Co Ltd | Claw pole type motor and pump |
US7839046B2 (en) | 2007-09-20 | 2010-11-23 | Panasonic Electric Works Co., Ltd. | Claw pole type motor and pump |
Also Published As
Publication number | Publication date |
---|---|
EP0568347A1 (en) | 1993-11-03 |
US5331237A (en) | 1994-07-19 |
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